语域是指具体语言环境下语言使用的变体。语域的三个显著特征是语场、语旨和语式。由于母语的负迁移和中介语的影响及外语综合能力、交际能力的有限性,许多学习者常误用英语语域而导致交际失败。本文介绍了语域的概念及语域意识在专业英语语言教学中的重要地位,并认为在语言学习初级和中高级阶段均应该增强学生的语域意识,最终达到恰当使用英语的目的。 Register is a variant of the language used in a specific language environment. Three salient features of the register are the language field, language and language. Due to the negative transfer of mother tongue and the influence of interlanguage, as well as the ability of foreign language synthesis and communicative competence, many learners often misuse English register to cause communication failure. This paper introduces the concept of register and the importance of register awareness in ESP teaching, and believes that students should be encouraged to have their own domain awareness in the primary and secondary advanced stages of language learning and eventually achieve the proper use of English.